Caesar Cipher Algorithm C Program

Let us learn how to write a program to encrypt and decrypt using caesar cipher in C programming. Here, we shall see two different ways of implement caesar cipher algorithm in C programming language.

What is Caesar Cipher Algorithm?

The Caesar Cipher algorithm is one of the oldest methods of password encryption and decryption system. It is popular by the following naming conventions:

Caesar shift

Caesar’s cipher

Shift cipher

Caesar’s code

This caesarc cipher encryption algorithm is a kind of substitution cipher wherein every character in the plain-text or the user input is replaced by another character which is defined with a fixed number of positions away from the existing character.

Caesar Cipher Encryption and Decryption Example

Input: ABCDEFGHIJ

Encrypted String: KLMNOPQRST

As you can find out from the encrypted string, we have moved every character’s position by 10 towards the right. You can implement your own complex calculations as well.

However, this method cannot be implemented in real time systems for encrypting and decrypting strings as these are very easy to decode. In this method, every string character is replaced by a fixed value.

Apart from caesar cipher encryption and decryption algorithm, there are many different algorithms used for encrypting and decrypting passwords or strings. Some of them are:

Output

If you have any doubts or compilation errors in this C program to perform encryption and decryption using caesar cipher algorithm, let us know about it in the comment section below. Find more about it on Wikipedia.